A CDE Definition
See VoIP modem.
(1) (Voice Over IP modem) A device that converts Internet-based voice service from the cable or telephone company to the user's telephones. Officially called an analog telephone adapter.
(2) (Voice Over IP modem) A device that converts Internet-based voice service from the cable company to the user's analog telephones. A VoIP modem combines a DOCSIS cable modem and analog telephone adapter (ATA) in one unit. Officially an "embedded-multimedia terminal adapter" (E-MTA), the modem converts the cable company signals to packets and vice versa, and the terminal adapter converts the packets to analog voice and vice versa. The adapter also delivers dial tone and manages the call setup.
If the VoIP modem supports cable access, it may be called a "VoIP cable modem," and for DSL telephone access, a "VoIP DSL modem."
PacketCable certification from CableLabs ensures that quality of service (QoS) and other critical telephony and real-time functions are supported for delivering multimedia over IP. See analog telephone adapter, VoIP, cable modem and DOCSIS.
Combined and Separate Units
Connecting a VoIP Cable Modem
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